Overview
- Description
- Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authentication, obtain sensitive information, or cause a denial of service (disk corruption) via backspace characters in the (1) grub_username_get function in grub-core/normal/auth.c or the (2) grub_password_get function in lib/crypto.c, which trigger an "Off-by-two" or "Out of bounds overwrite" memory error.
- Source
- cve@mitre.org
- NVD status
- Modified
Risk scores
CVSS 3.1
- Type
- Secondary
- Base score
- 7.4
- Impact score
- 5.9
- Exploitability score
- 1.4
- Vector string
- CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Severity
- HIGH
CVSS 2.0
- Type
- Primary
- Base score
- 6.9
- Impact score
- 10
- Exploitability score
- 3.4
- Vector string
- AV:L/AC:M/Au:N/C:C/I:C/A:C
Social media
- Hype score
- Not currently trending
Configurations
[
{
"nodes": [
{
"negate": false,
"cpeMatch": [
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"vulnerable": true,
"matchCriteriaId": "936B2F89-3A97-46A8-B776-CF605C192CA2"
},
{
"criteria": "cpe:2.3:a:gnu:grub2:1.99:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "6FB62F6A-8B42-4186-99AF-2A07050EB19E"
},
{
"criteria": "cpe:2.3:a:gnu:grub2:2.00:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "D3AB3BF3-95F2-43C6-8445-4B749135BE8E"
},
{
"criteria": "cpe:2.3:a:gnu:grub2:2.01:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "F3C7F246-9B64-49C4-B358-C5A62C3A2458"
},
{
"criteria": "cpe:2.3:a:gnu:grub2:2.02:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "7AEB4A3C-A448-4C7D-8F08-57940E13BB6D"
}
],
"operator": "OR"
}
]
},
{
"nodes": [
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"negate": false,
"cpeMatch": [
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"criteria": "cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:*",
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}
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"operator": "OR"
}
]
}
]